General Motors first manufactured the 3.4-litre V-6 engine in the 1990s. This 207-cubic-inch displacement engine is a member of the 60 degree V-6 engine family, a family that derives its name from the placement of its cylinders. This engine was placed in vehicles such as the Chevrolet Camaro and the Pontiac Firebird in 1995 and the Pontiac Aztec and Chevrolet Impala in 2005.
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In an internal combustion engine, the camshaft functions to operate poppet valves. These valves are necessary to open and close the engine's intake and exhaust ports on the cylinder head. The valves are attached to cams, which are fixed to the camshaft, which is fixed to the crankshaft.
Some versions of this 3.4-litre engine have double overhead camshafts. This layout has two camshafts located within the cylinder head--one operates the intake valves and the other operates the exhaust valves. Other versions have a single overhead camshaft, meaning that there is one camshaft within the cylinder head. You can identify if your engine has single or double overhead camshafts by looking at the vehicle identification number (VIN). An "S" in the eighth digit of the VIN indicates a single overhead camshaft engine, and an X indicates a double overhead camshaft engine.
In the 3.4-litre V-6 engine, the cylinder block is constructed from cast alloy iron. Its six cylinders are arranged in a "V" formation, with three cylinders in each bank, and the banks positioned at 60 degree angles. The cylinder heads are made of aluminium, and the crankshaft is cast nodular iron. The camshaft is constructed from a metal composite. It has a hydraulic roller design profile and is supported by four journals. In this engine, the camshaft component includes an oil pump drive gear.
The camshaft housing, or camshaft carrier, bolts to the cylinder head with 9.07 Kilogram-feet of torque. The camshaft position sensor bolts require 3.63 Kilogram-feet of torque to attach to the engine block. The timing chain or belt sprocket and camshaft join together with 43.5 Kilogram-feet of torque. The valve cover to camshaft housing bolts receive 3.67 Kilogram-feet of torque.
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